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. Open-path measurements of methane (CH4) with the useof GasFinder systems (Boreal Laser Inc, Edmonton Canada) have beenfrequently used for emission estimation with the inverse dispersion method(IDM), particularly from agricultural sources. It is common to many IDMapplications that the concentration enhancement related to CH4 sourcesis small, typically between 0.05 and 0.5 ppm, and accurate measurements ofCH4 concentrations are needed at concentrations close to ambientlevels. The GasFinder3-OP (GF3) device for open-path CH4 measurementsis the latest version of the commercial GasFinder systems by Boreal LaserInc. We investigated the uncertainty of six GF3 devices from side-by-sideintercomparison measurements and comparisons to a closed-path quantumcascade laser device. The comparisons were made at near-ambient levels ofCH4 (85 % of measurements below 2.5 ppm) with occasional phases ofelevated concentrations (max. 8.3 ppm). Relative biases as high as 8.3 %were found, and a precision for half-hourly data between 2.1 and10.6 ppm-m (half width of the 95 % confidence interval) was estimated.These results deviate from the respective manufacturer specifications of 2 % and 0.5 ppm-m. Intercalibration of the GF3 devices by linear regressionto remove measurement bias was shown to be of limited value due to driftsand step changes in the recorded GF3 concentrations.

Performance of open-path GasFinder3 devices for CH&lt;sub&gt;4&lt;/sub&gt; concentration measurements close to ambient levels

Performance of open-path GasFinder3 devices for CH<sub>4</sub> concentration measurements close to ambient levels